How to bring back first start Key configure preset selection?
On the top meny choose: File &gt; Defaults &gt; Load Factory Settings.
Or delete the userpref.blend file.
To find it, read this link:
Where is the startup file stored?
or read the manual page:
https://docs.blender.org/manual/en/latest/advanced/blender_directory_layout.html?highlight=userpref